Render a template
Compiles and renders a version and returns the HTML, plain text and subject. No side effects — nothing is sent. This is the authoring inner loop: compile and render failures come back as invalid_request carrying the verbatim diagnostics, so you can fix the source and retry.
bearerAuth writeAuthorizationBearer <token>An API key from the dashboard under Settings → API keys, sent as Authorization: Bearer aem_….
Authorization has two independent axes.
The scope is ranked — a key satisfies any requirement at or below its own tier:
read— see messages, contacts and metrics. Changes nothing, and cannot send.write— everythingreaddoes, plus managing templates, contacts, automations, segments and suppressions. This is what editing a template needs.admin— everythingwritedoes, plus sending configuration: domains, senders, webhook registration, kill switch, daily cap, brand.
There is no approve scope. It was a rung once; it is not one now, and a key requested with it is rejected.
The approval grant (can_approve) is a separate boolean, not a rung. Delivering mail to a real inbox needs write and the grant. Keeping them on separate axes is what makes the review gate a control rather than a convention: a key that may propose is not automatically a key that may approve its own proposal.
Give your application the lowest tier that works. Most need write and the grant — the dashboard mints that combination as Send + manage; Manage only is the same rung with the grant withheld.
Scope: write
slug*stringTemplate slug.
application/json- body
version?integerVersion to render. Omit for the latest.
0 < value <= 9007199254740991props?Values for the template's variables. Omit to render with generated example props.
Rendered output.
application/json- response
slug?stringversion?integersubject?stringhtml?stringtext?stringprops_used?The props actually rendered with — generated examples when you passed none.
curl -X POST 'https://sendandretain.com/api/v1/templates/string/render' \ -H 'Content-Type: application/json' \ -d '{ "props": { "firstName": "Jane" }}'{ "slug": "string", "version": 2, "subject": "Welcome to Acme, Jane", "html": "string", "text": "string", "props_used": {}}